排灌机械工程学报2024，Vol.42Issue(7)：649-656,8.DOI:10.3969/j.issn.1674-8530.22.0183
叶片隆起对离心泵空化性能的影响
Effect of raised blade on cavitation performance of centrifugal pumps
摘要
Abstract
A method was proposed to improve the cavitation performance of centrifugal pumps by arran-ging a raised structure on the blade working surface.Based on the RNG k-e turbulence model and Kubota cavitation model,the three-dimensional unsteady cavitation flow was numerically simulated,and the cavitation development under the initial blade profile and raised blade profile was analyzed in detail.The simulation results show that the head of the raised blade profile is slightly lower than that of the initial smooth blade profile before cavitation occurres.When the cavitation number is reduced to lower than 0.43,the head of the raised blade is higher than that of the initial blade,the head with 2 mm raised diameter is the highest.The raised structure delays the occurrence of cavitation and shows a good inhibition effect on cavitation phenomenon.In the stage of cavitation development,the raised structure of the blade working surface increases the area and surface roughness of the blade working surface,which changes the internal flow channel structure of the impeller,forms a relatively high-pres-sure area and high turbulent kinetic energy near the wall.The pressure gradient increases,and the area of the low-pressure area at the impeller inlet reduces,which effectively reduces the cavitation volume,and inhibits the occurrence and development of cavitation.At different stages of cavitation development,the raised structure at different positions on the working face has no significant impact on cavitation development.关键词
离心泵/隆起叶型/抑制空化/数值模拟Key words
centrifugal pump/raised blade/cavitation suppression/numerical simulation分类
农业科技引用本文复制引用
刘厚林,顾建彬,王勇,王哓林,李明..叶片隆起对离心泵空化性能的影响[J].排灌机械工程学报,2024,42(7):649-656,8.基金项目
国家自然科学基金资助项目(52179084,52379090) （52179084,52379090）
